Help Minecraft Sword For Tomorrow

I need to make a minecraft sword that sticks into the cake for tomorrow. I made one of gum paste yesterday (looks great) but it is not going to dry in time. Any tips... can I make it with cardboard and cover with fondant. If so how will it work and will it hold up and dry in time. It is for my twins bday tomorrow so I really do want this to happen?

you can cover cardboard if you want be sure it has some bamboo skewers threaded into the corrugations or use foamcore board --

also i have a warming drawer i use to dry my fondant/gum paste pieces -- you never want to get above 150 degrees -- leaving it an oven that has a pilot light will also help -- and don't touch the items while they're warm